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1、New Trends and Problems in Material Processing Machine Design Theory WANG Ai-lun ,DUAN Ji-an ,HUANG Ming-hui ,ZHONG Jue(College of Mechanical & Electronic Engineering ,Central South University ,Changsha 410083 ,Hunan China)Abstract : Based on reviewing the historical background, prospecting for the
2、development trend ,analyzing the complicacy and mechanism and summing up some achievements and experiences in scientific research , several new problems and the possible direction of development in material processing technology and machine are proposed ,such as ,producing new concept materials poss
3、essing some specific and extraovdinary properties by means of integrating and coalescing conelative frontier science and technology ;and thereafter a brief discussion is given.Keywords: interface; extraordinary physical field; procession machine ; function material1The Time Background of Material Pr
4、ocessing MachineIn the long span of history of human progress ,many tools ,machines and methods were created and a variety of materials with different properties were processed. Materials and its processing have become one of pillar and driving force of mankind progress. In pace with multi - polar c
5、ompetition in current world and peoples striving perseveringly for happier life ,material function goes beyond unceasingly mens knowledge and imagination ,for example ,cryptic function material ,semiconductor material ,energy material ,vibration - absorptive material , super - strength aluminum allo
6、y accounting for 70 percent of application of aeronautics and space ,metal foil of 45m ,deep drawing plate with anisotropy below 1 percent ,electronic aluminum foil with micro - orientation up to 95 percent ,heat resisting aluminum alloy with super strong specific strength used in aeronautics ,space
7、 and deep sea ,etc. Thus several important development trends with distinct time features in material processing domain are shaped up as follows : (1) Creating material processing machine with extraordinary physical field for processing material with special texture structures and functions. For exa
8、mple ,applications of thermal energy and mechanical energy are breaking through unceasingly technology limit ,and some non - tradition energy ,such as microwave ,chemical energy , bioenergy , etc. , are introduced into material processing procedure one after another ,so that some material processing
9、 machines with extraordinary energy circumstance are produced. (2) Breaking through traditional physical limits and integrating melting ,solidifying ,plastic deformation and heat treatment to obtain special function of material and cut down expenses3 . For example ,near - net shaping material proces
10、sing technology , such as fast rolling , spraying deposition ,over - plastic molding , injection molding , high energy beam ,etc ,is applied. (3) Material processing process is forged ahead in the direction of high speed ,heavy - duty and high accuracy online control ,for instance , the rolling spee
11、d goes up to 130 ms - 1 ,the deformation pressure rises up to 300 MPa ,accuracy of dimension up to 0.1m ,accuracy of shape up to 0. 1 I ,strength accuracy comes up to 0.1 MPa. For these reasons ,it is necessary for material processing machine design theory to integrate and coalesce ingeniously corre
12、lative frontier science and technology to create and produce some new concept material processing machine with following functions.2Due Functions of New Concept Material Processing Machine (1) To have the ability to produce and bear extraordinary physical field and transmit extraordinary energy flow
13、 with the aim of providing extraordinary physical circumstances necessary for new concept material processing. For example ,high gradient temperature field with the speed of cool - down of work interface which exceeds 104106 Ks - 1 , line wave and pulse complex exerted in solidifying - deforming are
14、a , super - strength contact stress field of material forming interface ,turbulent flow field of molten metal with very big flakiness ratio ,low frequency magnetic field with random frequency ,microwave field for powder metal heating ,ultrasonic field for large volume solidifying ,etc. 4 ,are applie
15、d. (2) To have the ability to work in critical state so that high stability and ideal performance of processing machine is ensured under the circumstance of reinforced technological condition and multi - field coupling operation. For example ,chatter suppressing capability of fast ultra - thin rolli
16、ng under the condition of boundary lubricating state5 ,the capability of self - excited vibration suppressing under the condition of special friction state ,synergism stability and disturbance stability of flexible connecting parallel shaft with multi - driving system ,etc. 4 ,are ensured. (3) To have the ability to accurately control the material processing in order to obtain low lo
